It's supposed to encourage the skin's renewal process, which slows as we age.
Times, Sunday Times
If you stay up, the renewal process will go up.
The Sun
He also began a renewal process, a work of re-creation throughout the cosmos.
Christianity Today
Its mix of vitamins and amino acids boosts the skin's renewal process.
The Sun
Oh, and did you know exfoliating speeds up the cell renewal process?
The Sun